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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Rear Drivelines, Drive Axles and Gearing => Topic started by: Swampyankee74 on February 25, 2023, 09:57:32 AM

Title: Driveshaft durability
Post by: Swampyankee74 on February 25, 2023, 09:57:32 AM
I have a 74 c1500 which originally came with a 250 6cl. I now have a 465 horse small block with a m21 tranny.  Is the stock driveshaft going to be able to handle that with occasional abuse? Or turn into a twizzler?
Title: Re: Driveshaft durability
Post by: JohnnyPopper on February 25, 2023, 09:01:18 PM
LOL Red twizzler

Pry a bd question.
Title: Re: Driveshaft durability
Post by: VileZambonie on February 26, 2023, 06:07:35 AM
Didn't you say you were lowering it? If so what method did you use to lower the rear? Check your operating angles, make sure appropriate clearance, slip and good u-joints. Download the angle meter app on your phone.
Title: Re: Driveshaft durability
Post by: Swampyankee74 on February 26, 2023, 07:55:03 AM
I did lower it 4 inches in the back by spring hanger and shackle method. I'll make sure all clearances, and that the slip yoke isnot to far into the tranny, and new u joints. Just checking to see if that old tube could take the beating.